Beneficiary Designation Strategy: How to Pass IRAs and 401(k)s Correctly

For the broader inheritance context, start with Estate and Inheritance Planning: A Complete Guide. This piece focuses specifically on beneficiary designation strategy — decisions that can save your heirs hundreds of thousands of dollars in unnecessary taxes.

Why beneficiary designations matter more than your will

Your will controls probate assets — anything you own that isn’t directly transferred through another mechanism. Beneficiary designations on retirement accounts, life insurance, annuities, and transfer-on-death accounts bypass probate entirely. They go directly to whoever you designated, regardless of:

• What your will says
• What your trust says
• What your ex-spouse’s rights might be under divorce
• What your current spouse’s expectations are

A real risk: If you divorced and remarried but never updated your IRA beneficiary, your ex-spouse likely still inherits the account. Your current spouse receives nothing from that asset regardless of your will. This is one of the most common and painful inheritance mistakes.

Review beneficiaries after every major life event:

• Marriage or divorce
• Birth or adoption of a child
• Death of a beneficiary
• Major asset purchases (especially new retirement accounts)
• Moving to a new state
• Substantial changes in net worth

The three-category beneficiary framework under SECURE Act

For deaths after December 31, 2019, retirement account beneficiaries are sorted into three categories, each with different distribution rules:

Category 1: Eligible Designated Beneficiaries (EDBs)

Five groups qualify for “stretch” distributions over their lifetime:

1. Surviving spouse has the most flexibility — can treat inherited IRA as their own, roll into their own IRA, or take as beneficiary IRA. Each option has different rules and implications.

2. Minor child of the account owner (biological or legally adopted) can use life expectancy stretch until reaching age 21. After age 21, the 10-year rule applies. Note: this only covers the account owner’s own children, not grandchildren or nieces/nephews.

3. Disabled individual as defined by IRC §72(m)(7) — unable to engage in substantial gainful activity due to medically determinable physical or mental impairment expected to be long-term or lead to death.

4. Chronically ill individual as defined by IRC §7702B(c)(2) — unable to perform at least 2 of 6 daily living activities for at least 90 days, or suffering severe cognitive impairment.

5. Individual not more than 10 years younger than the original account owner. Often applies to sibling beneficiaries, or unrelated adults in similar age cohorts.

EDBs can stretch inherited IRA distributions over their life expectancy, preserving the tax-deferred (or tax-free, for Roth) compounding for much longer than 10 years. This was the traditional “stretch IRA” strategy.

Category 2: Designated Beneficiaries (non-eligible)

Everyone else who is a designated individual beneficiary. This typically includes:

• Adult children of the account owner
• Grandchildren
• Parents (if naming upward)
• Siblings who are more than 10 years younger
• Adult friends or unrelated individuals

These beneficiaries are subject to the 10-year rule: the entire inherited account must be fully distributed by December 31 of the 10th calendar year following the year of the original owner’s death.

Two sub-rules within the 10-year rule:

If the original owner died before their Required Beginning Date (RBD) for RMDs:

• No annual RMDs required during years 1-9
• Beneficiary can choose any distribution pattern (lump sum day 1, all in year 10, or anywhere in between)
• Just must be fully distributed by end of year 10

If the original owner died on or after their RBD:

• Annual RMDs required in years 1-9, calculated on the beneficiary’s life expectancy
• Plus fully distributed by end of year 10
• IRS granted penalty waivers for missed RMDs during 2021-2024, but annual RMDs are now required starting 2025

Current RBD ages:

• Born 1951-1959: RBD is April 1 after age 73
• Born 1960 or later: RBD is April 1 after age 75 (SECURE 2.0)
• Roth IRAs: No RBD during original owner’s lifetime, so the “died before RBD” sub-rule always applies for Roth

Category 3: Non-Designated Beneficiaries

Non-individuals — estates, charities, or non-qualifying trusts. Subject to more restrictive rules:

If owner died before RBD:

• 5-year rule: entire account must be distributed by end of year 5

If owner died on or after RBD:

• Must continue distributions based on owner’s remaining life expectancy at death
• Typically faster distribution than 10-year rule, but doesn’t face a hard deadline

Key takeaway: Never name your estate as beneficiary. Always name a person or qualifying trust. Naming estate triggers the worst distribution rules and subjects the asset to probate.

Per stirpes vs. per capita

These two terms control what happens when a primary beneficiary predeceases you:

Per stirpes (by the stock): If a beneficiary dies before you, their share passes to their descendants. If you name your three children as beneficiaries per stirpes, and one child dies leaving two grandchildren, each grandchild gets 1/6 of the account (half of the deceased parent’s 1/3 share).

Per capita (by the head): If a beneficiary dies before you, their share is redistributed among surviving beneficiaries. Using the same example, each surviving child would receive 1/2 instead of 1/3.

Strategic considerations:

• Per stirpes preserves inheritance for each family branch. Generally preferred for equal treatment of grandchildren regardless of whether their parent is alive.
• Per capita simplifies administration. All surviving beneficiaries get equal shares. Easier but disadvantages grandchildren.
• Most plans default to something. Review what your plan defaults to and whether it matches your intent.

Spousal beneficiary options

Surviving spouses have more flexibility than any other beneficiary. Three main options:

1. Treat as own IRA. Roll the inherited IRA into your own IRA or elect to treat it as your own. Benefits: no RMDs until your own RBD, flexibility to convert to Roth, simpler administration.

2. Inherited IRA. Keep the account titled as “inherited IRA” with the deceased spouse as original owner. Benefits: access to penalty-free withdrawals before age 59½ (no 10% early withdrawal penalty for inherited IRAs), potentially smaller RMDs if spouse was younger.

3. Disclaim the inheritance. Decline the inheritance, letting it pass to contingent beneficiaries. Benefits: allows estate planning flexibility if you don’t need the funds and contingent beneficiaries would benefit more.

New SECURE 2.0 option for spouses of decedents who died before RBD: Spouses can elect to be treated as the deceased owner for RMD purposes, deferring RMDs until the deceased owner would have reached RBD.

The Roth conversion opportunity for wealth transfer

For families planning to leave substantial IRA balances to non-spouse beneficiaries, Roth conversions during life can dramatically improve after-tax outcomes.

The problem with inherited traditional IRAs:

• Non-spouse beneficiaries must fully distribute within 10 years (in most cases)
• All distributions are ordinary income at beneficiary’s marginal rate
• Beneficiaries typically receive these during peak earning years, at higher rates than the original owner
• Large distribution in a single year can push beneficiary into top brackets
• No step-up in basis at death (IRAs are “income in respect of a decedent”)

Example: Traditional IRA inheritance.

Parent’s $1M traditional IRA passes to 45-year-old child earning $150K/year (22% federal bracket).

Under 10-year rule, child distributes roughly $100K/year from the inherited IRA (if spreading evenly). Combined with $150K W-2 income, child’s taxable income becomes $250K. Federal marginal rate jumps to 32%. Plus state tax.

At 32% federal + 6% state + 7.65% FICA (doesn’t apply to IRA) — say combined ~38% on inherited distributions — child nets roughly $620K of the $1M over 10 years. Effectively $380K of the inheritance went to taxes.

With Roth conversion strategy:

Parent converts some portion (say $300K) to Roth over several years during lower-income retirement years, paying tax at 22% federal ($66K in conversion taxes).

At death, $700K traditional + $300K Roth inherited by child.

• Child inherits $700K traditional, pays ~38% on withdrawals: nets $434K
• Child inherits $300K Roth, pays 0% on withdrawals: nets $300K
• Total: $734K to child

Net benefit of conversion strategy: $114K more to child. The parent paid $66K of conversion tax during life, but the child saved $180K of taxation on the inherited Roth amount.

The math favors Roth conversions whenever the child’s expected marginal rate exceeds the parent’s current marginal rate — which is true for most middle-to-upper-income families during working years inheriting from retired parents in lower brackets.

Trusts as IRA beneficiaries

Naming a trust as IRA beneficiary is legal but complex. Two types of trusts commonly used:

See-through conduit trusts. All distributions from the IRA pass immediately through the trust to the individual beneficiary. The trust is ignored for RMD purposes; distributions are based on the underlying beneficiary’s status (EDB or designated beneficiary).

See-through accumulation trusts. Distributions from the IRA can be accumulated inside the trust rather than passed through to beneficiaries. Provides more control (e.g., for spendthrift beneficiaries, minor children, special needs beneficiaries) but subject to more restrictive distribution rules.

Strict requirements to qualify as “see-through”:

1. Trust must be valid under state law
2. Trust must be irrevocable upon death of IRA owner
3. Beneficiaries must be identifiable
4. Proper documentation must be provided to plan administrator by October 31 of year after death
5. All beneficiaries must be individuals (not charities, estates, or non-qualifying entities)

When trusts make sense as beneficiaries:

• Special needs beneficiaries where direct inheritance would disqualify them from government benefits
• Minor children requiring oversight until adulthood
• Spendthrift beneficiaries where unrestricted access would be harmful
• Second marriages where you want to provide for current spouse but ensure assets pass to children from first marriage
• Creditor protection needs
• GST tax planning for transfers to grandchildren

When NOT to use a trust as beneficiary:

• For simplicity in straightforward family situations
• To avoid unnecessary complexity in trust administration
• When direct beneficiary designation accomplishes the same goal

Common beneficiary designation mistakes

Leaving it blank. Without a designated beneficiary, the account typically defaults to the estate, subjecting it to probate and the most restrictive distribution rules.

Forgetting to update. Ex-spouses named as beneficiaries remain inheritors regardless of divorce.

Naming only primary, no contingent. If primary predeceases you and no contingent is named, default rules apply (often estate).

Naming minor children directly. Creates complications — the minor can’t legally control the account. Court-appointed custodian or guardianship may be required. Better to name a trust or UTMA account.

Not coordinating with estate plan. Beneficiary designations should align with your overall estate plan. A designation that passes to one beneficiary while your will says something else creates confusion and potentially disputes.

Naming non-individuals for tax reasons. Charities as partial beneficiaries of IRAs is tax-efficient (charities pay no income tax on distributions). But don’t name a charity as partial beneficiary alongside individuals — this can eliminate the individuals’ “designated beneficiary” status and force them to 5-year rule distribution. Use separate accounts or specific bequest language.

Missing spousal consent. Most 401(k) plans require spousal consent to name anyone other than spouse as primary beneficiary. Skipping this renders the designation invalid.

Using “Jane Doe if living” language incorrectly. Can create unintended per capita rather than per stirpes distribution. Use standard plan forms carefully.

Not documenting the 10-year clock. Heirs sometimes miss the end-of-year-10 deadline, facing 25% excise tax (reduced from 50% under SECURE 2.0) on the amount not timely distributed.

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Frequently asked questions

Sources

Chris Gammill is the founder of Ignis Tools and writes about tax-aware retirement planning. Research and drafting assisted by AI tools; all figures and claims verified by the author against primary sources.

1. IRS — Retirement plan and IRA required minimum distributions FAQs — retrieved 2026-04-21
2. IRS Final Regulations on RMDs (September 2024) — retrieved 2026-04-21
3. Charles Schwab — Inherited IRA Rules & SECURE Act 2.0 Changes — retrieved 2026-04-21
4. Vanguard — RMD rules for IRA beneficiaries — retrieved 2026-04-21